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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 670 · 40 sums
TalentJR

The method (Column by column): Line up ones, tens and hundreds. Add from the right; 10 or more → carry 1 to the next column. Subtract from the right; top digit smaller → borrow 1 from the next column. Missing number in an addition = total − the number you know.

NameDateTime takenScore ___ / 40
  1. 1.584 − 370 =
  2. 2.708 − 385 =
  3. 3.792 − ? = 383
  4. 4.? − 408 = 343
  5. 5.876 + 118 =
  6. 6.A school has 414 children. 144 of them are girls. How many boys are there?
  7. 7.? − 514 = 217
  8. 8.246 + 559 =
  9. 9.825 + ? = 972
  10. 10.443 − 104 =
  11. 11.A school has 485 children. 330 of them are girls. How many boys are there?
  12. 12.633 − 203 =
  13. 13.310 − 190 =
  14. 14.? + 288 = 548
  15. 15.? + 579 = 684
  16. 16.A train has 615 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  17. 17.A train has 564 people in the front coaches and 141 people in the back coaches. How many people are on the train?
  18. 18.A train has 432 people in the front coaches and 515 people in the back coaches. How many people are on the train?
  19. 19.A train has 691 people in the front coaches and 235 people in the back coaches. How many people are on the train?
  20. 20.728 + 146 =
  21. 21.516 − 380 =
  22. 22.A school has 265 children. 196 of them are girls. How many boys are there?
  23. 23.346 + ? = 772
  24. 24.894 + 101 =
  25. 25.A train has 689 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  26. 26.? + 700 = 982
  27. 27.A school has 205 children. 158 of them are girls. How many boys are there?
  28. 28.A train has 437 people in the front coaches and 292 people in the back coaches. How many people are on the train?
  29. 29.A school has 948 children. 796 of them are girls. How many boys are there?
  30. 30.262 + 595 =
  31. 31.? − 209 = 287
  32. 32.302 − 260 =
  33. 33.682 − 360 =
  34. 34.A school has 499 children. 252 of them are girls. How many boys are there?
  35. 35.868 + 116 =
  36. 36.? − 254 = 152
  37. 37.816 − 733 =
  38. 38.145 + 820 =
  39. 39.A school has 576 children. 121 of them are girls. How many boys are there?
  40. 40.A school has 487 children. 483 of them are girls. How many boys are there?

Answer key

  1. 214
  2. 323
  3. 409
  4. 751
  5. 994
  6. 270
  7. 731
  8. 805
  9. 147
  10. 339
  11. 155
  12. 430
  13. 120
  14. 260
  15. 105
  16. 744
  17. 705
  18. 947
  19. 926
  20. 874
  21. 136
  22. 69
  23. 426
  24. 995
  25. 806
  26. 282
  27. 47
  28. 729
  29. 152
  30. 857
  31. 496
  32. 42
  33. 322
  34. 247
  35. 984
  36. 406
  37. 83
  38. 965
  39. 455
  40. 4

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